Revert D26369476: [pytorch][PR] [complex] `masked_fill`: Complex Autograd support and update masked_scatter skips.
Test Plan: revert-hammer
Differential Revision:
D26369476 (https://github.com/pytorch/pytorch/commit/7a408c72907c4a05fadd2b0ffa2735cafe09ec94)
Original commit changeset: 7a79d5a609b0
fbshipit-source-id: f0011f40962ccbcd8e7c19bd727e1e49cf2ec0c4
